20980393 has 16 divisors (see below), whose sum is σ = 25214976. Its totient is φ = 17067600.

The previous prime is 20980391. The next prime is 20980403. The reversal of 20980393 is 39308902.

It is a cyclic number.

It is not a de Polignac number, because 20980393 - 2¹ = 20980391 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (20980391) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 23880 + ... + 24742.

It is an arithmetic number, because the mean of its divisors is an integer number (1575936).

Almost surely, 2^20980393 is an apocalyptic number.

20980393 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

It is an amenable number.

20980393 is a deficient number, since it is larger than the sum of its proper divisors (4234583).

20980393 is a wasteful number, since it uses less digits than its factorization.

20980393 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1044.

The product of its (nonzero) digits is 11664, while the sum is 34.

The square root of 20980393 is about 4580.4358962876. The cubic root of 20980393 is about 275.8065270502.

The spelling of 20980393 in words is "twenty million, nine hundred eighty thousand, three hundred ninety-three".